J. Mater. Sci. Technol. ›› 2021, Vol. 85: 1-10.DOI: 10.1016/j.jmst.2021.01.022
• Research Article • Next Articles
Jin Liua,**(), Sheng Guoc,d, Hongzhang Wua, Xinlei Zhanga, Jun Lib,**(), Kun Zhoud,e,*()
Received:
2020-09-01
Revised:
2020-11-27
Accepted:
2021-01-03
Published:
2021-09-20
Online:
2021-02-08
Contact:
Jin Liu,Jun Li,Kun Zhou
About author:
kzhou@ntu.edu.sg (K. Zhou).Jin Liu, Sheng Guo, Hongzhang Wu, Xinlei Zhang, Jun Li, Kun Zhou. Synergetic effects of Bi5+ and oxygen vacancies in Bismuth(V)-rich Bi4O7 nanosheets for enhanced near-infrared light driven photocatalysis[J]. J. Mater. Sci. Technol., 2021, 85: 1-10.
Fig. 1. Crystal structures of (a) Bi2O3 and (b) Bi4O7. Band structure of (c) Bi2O3 and (d) Bi4O7. Calculated total density of states and partial density of states of (e) Bi2O3 and (f) Bi4O7.
Fig. 3. (a) EPR spectra and (b) TG-DSC curves of the bulk Bi2O3 and Bi4O7 nanosheets. High-resolution XPS spectra of the Bi4O7 nanosheets and bulk Bi2O3: (c) Bi 4f and (d) O 1s.
Sample | Hall mobility (m²/V·s) | Carrier Concentration (1/m³) | Hall coefficient (m³/C) | Resistivity (Ω·m) | Hall voltage (V) | Conduction type |
---|---|---|---|---|---|---|
Bi4O7 | -7.082 × 10-4 | 5.364 × 1015 | 1.164 × 103 | -1.643 × 107 | 3.039 × 10-3 | p |
Bi2O3 | -2.357 × 10-1 | 5.113 × 1015 | 1.221 × 103 | -5.178 × 103 | 2.297 × 10-2 | p |
Table 1 Electrical properties of Bi4O7 and Bi2O3.
Sample | Hall mobility (m²/V·s) | Carrier Concentration (1/m³) | Hall coefficient (m³/C) | Resistivity (Ω·m) | Hall voltage (V) | Conduction type |
---|---|---|---|---|---|---|
Bi4O7 | -7.082 × 10-4 | 5.364 × 1015 | 1.164 × 103 | -1.643 × 107 | 3.039 × 10-3 | p |
Bi2O3 | -2.357 × 10-1 | 5.113 × 1015 | 1.221 × 103 | -5.178 × 103 | 2.297 × 10-2 | p |
Fig. 5. (a) CIP degradation under different conditions and (b) the corresponding kinetic analysis. (c) Degradation rate and TOC removal rate of CIP over the Bi4O7 nanosheets. (d) Cycling experiments for CIP degradation over Bi4O7 nanosheets under visible and NIR light irradiation.
Fig. 7. (a) Radical trapping experiments over Bi4O7 nanosheets. (b) ESR spectra of TEMP-1O2 over the Bi4O7 nanosheets and bulk Bi2O3 after 5 min of visible light irradiation.
Fig. 8. Transient photocurrent response under (a) visible and (b) NIR light illumination. (c) Electrochemical impedance spectroscopy and (d) time-resolved PL spectra of the Bi4O7 nanosheets and bulk Bi2O3.
Sample | Parameter | Lifetime (ns) | χ2 |
---|---|---|---|
Bi4O7 | τ1 | 2.81 | 1.118 |
τ2 | 13.25 | ||
<τ> | 6.75 | ||
Bi2O3 | τ1 | 2.76 | 1.253 |
τ2 | 13.07 | ||
<τ> | 6.43 |
Table 2 PL decay parameters of Bi4O7 nanosheets and bulk Bi2O3.
Sample | Parameter | Lifetime (ns) | χ2 |
---|---|---|---|
Bi4O7 | τ1 | 2.81 | 1.118 |
τ2 | 13.25 | ||
<τ> | 6.75 | ||
Bi2O3 | τ1 | 2.76 | 1.253 |
τ2 | 13.07 | ||
<τ> | 6.43 |
Fig. 9. (a) Photocatalytic degradation of RhB over the Bi4O7 nanosheets and bulk Bi2O3. (b) Cycling experiments for RhB degradation over the Bi4O7 nanosheets. (c) Radical quenching experiments in the RhB degradation process.
Fig. 12. Possible synergic mechanism of Bi5+ and OVs for pollutant degradation over bulk Bi2O3 and Bi4O7 nanosheets under visible and NIR light irradiation.
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